Can an alert sound be added to the app to let you know that the transaction was cancelled as the message is only on the screen for a short time and can be mistaken for the transaction going ok.
Another way to submit suggestions or changes is to use the Site Feedback link from within your PayPay Account. The link is on every page. There's a survey question to answer and text box below. Use the text box to submit your suggestion or change. Seems they do have folks that look at the submissions.
